R
6
K and c are constants given in the following table:
Please note:
• The formula treats the cups as linear, which they are not.
• The formula is effective for flow times between 20 seconds and 80 seconds
a
.
Cup K c Cup K c
Zahn Cup 1
a
a. The constants are given in Patton, T. C., Paint Flow and Pigment Dispersion, second edition, John Wiley & Sons,
New York, 1979, page 82.
1.1 29 Shell Cup 1 0.226 13
Zahn Cup 2
a
3.5 14 Shell Cup 2 0.576 5
Zahn Cup 3
a
11.7 7.5 Shell Cup 2½ 0.925 3
Zahn Cup 4
a
14.8 5 Shell Cup 3 1.51 2
Zahn Cup 5
a
23 0 Shell Cup 3½ 2.17 1.5
Shell Cup 4 3.45 1
Shell Cup 5 6.5 1
Shell Cup 6 16.2 0.5
a. Zahn Cup 1 - formula is effective between 35 seconds and 80 seconds.
2210_TMA_0317_00_05.fm Page 6 Thursday, July 15, 2010 9:38 AM
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